#include <stdio.h>
int main(){
	char a[]="I am a boy.",b[20],*p1,*p2;
	p1=a;p2=b;
	for(;*p1!='\0';p1++,p2++)
	*p2=*p1;
	*p2='\0';
	printf("string a is:%s\n",a);
    printf("string b is:%s\n",b);
	return 0;
}